. A textbook of botany for colleges and universities ... Botany. SPERMATOPHYTES 219 beyond the groups previously considered in the loss of swimming sperms and the related structures of the ovules, and also in other features; nevertheless, it has also retained certain primitive features, as, for example, the presence of mesarch bundles in the cotyledons and even in the stem. The general relationships of the family will be con- sidered in connection with the Pinaceae. (b) Pinaceae General character.—This family, characterized in general by its conelike ovulate strobili and dry seeds, includes th
. A textbook of botany for colleges and universities ... Botany. SPERMATOPHYTES 219 beyond the groups previously considered in the loss of swimming sperms and the related structures of the ovules, and also in other features; nevertheless, it has also retained certain primitive features, as, for example, the presence of mesarch bundles in the cotyledons and even in the stem. The general relationships of the family will be con- sidered in connection with the Pinaceae. (b) Pinaceae General character.—This family, characterized in general by its conelike ovulate strobili and dry seeds, includes the conspicuous. Fig. 485. — Transverse section of a three-year-old twig of Pinus syheslris, sho^'vag the small pith, the thick and compact vascular cylinder of secondary wood, and the cortex; radiating lines through the wood represent the narrow pith rays; resin ducts in both wood (small) and cortex (large); to the right is a branch gap in the cylinder. gymnosperm vegetation of north temperate regions. Four tribes are recognized, as follows: Abietineae (9 genera and about 140 species), including pines, spruces, firs, hemlocks, larches, and cedars, the large genus being Pinus, with about 80 Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Coulter, John Merle, 1851-1928; Barnes, Charles Reid, 1858-1910, joint author; Cowles, Henry Chandler, 1869- joint author. New York, Cincinnati [etc] American book company
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1910
